Use Test Instruments To Set Combustion; Recommended Combustion Test Sequence - Beckett CG10 Manual

Use test instruments to set combustion:

Always use calibrated test
instruments to set combustion
levels. Verify that test instruments are calibrated and
in good working condition. If not already provided, drill
test access holes in the fl ue pipe near the breech (or
upstream of the boiler breech damper, if applicable) and
in the front mounting plate area for fi rebox pressure. Be
careful not to damage any water-backed surface.
Verify that all boiler sections, canopy, and access plates
or doors are fully equipped with gaskets and sealed
against any leakage, which could affect the combustion
test results. Before making these tests, operate the
burner for several minutes to allow the heating system
temperature to stabilize or nearly reach steady-state
levels. Record all results in the start-up log for future
reference.
○ Draft – Set the breech or furnace pressure to the
level specifi ed by the appliance manufacturer.
Typical example: +0.10" W. C.
○ Oxygen – It is recommended that you measure the
oxygen (O ) early in the test sequence because
2
high levels of carbon monoxide can be created at
very low or even very high O
operating range is between 2.5% – 4.5 %. The
equivalent carbon dioxide (CO
9% – 10.5%.
scanner signal that proves the burner is fi ring.
○ Carbon monoxide (CO) – An operating range of 0
-50 PPM is recommended for the CG10 burner. The
maximum carbon monoxide (CO) level permitted
in the fl ue gas by the UL 795 Standard is 400 PPM
(.04%).
○ Stack Temperature – The stack temperature should
be within the range specifi ed by the appliance
manufacturer. It is infl uenced by input fi ring rate,
fl ame shape, excess air ratio, and cleanliness of
boiler fl ue passages. This temperature, combined
with the ambient temperature, and O
used in calculating the appliance effi ciency.
CG10 Burner Manual
levels. The typical
2
) operating range is
2
High excess air levels reduce
the fl ames UV output and the
% (or CO
2

Recommended combustion test sequence:

1. Adjust the draft or breech pressure to the appliance
manufacturer's recommended level.
2. Measure the carbon monoxide level and adjust
air settings, if necessary, to regulate it to about 50
PPM for a starting point.
3. Measure the O
For this discussion, assume the O
CO ).
2
4. Open the air adjustment until the O
increased by at least 1% or to 3% O
is higher). This should reduce the CO level and
provide a margin of reserve air to accommodate
variable conditions.
5. Sample the CO level again. It should be in the 0 to
20 PPM range.
6. Check the draft to ensure it still meets
specifi cations. If a major change in draft is
required, repeat the above steps.
7. Perform any fi nal adjustments and lock the air
settings securely. Run the burner through several
cycles to verify prompt ignition and stable burner
operation.
) is
2
Section: Start the Burner
or CO at the 50 PPM CO level.
2 2
is 1.5% (11%
2
level is
2
(whichever
2
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